<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <div id="timer"> </div>
</body>
<script>
    //在timer中显示倒计时10秒钟 时间到 跳转到百度的首页
    var timer=document.getElementById("timer");
    //timer.innerHTML=10;获取（赋值）id=timer的html代码里的内容 
    var count=10;
    var intervalId=setInterval(function(){
        count=count-1;
        timer.innerHTML=count+"秒后跳转到百度";
       if(count==0){
           clearInterval(intervalId);
          // location.href="http://www.baidu.com";
           location.href="./demo11.html";
       }
    },1000)
</script>
</html>